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In system dynamics diagrams, stocks (also called accumulations) represent quantities that build up or deplete over time and are depicted as rectangles. Flows represent the rates of change that add to or subtract from these stocks and are depicted as arrows with valves.

Conditions: The context is introductory system dynamics modeling.; The model uses standard stock-and-flow diagram notation.

In system dynamics diagrams, stocks (also called accumulations) represent quantities that build up or deplete over time and are depicted as rectangles. Flows represent the rates of change that add to or subtract from these stocks and are depicted as arrows with valves.

Conditions: The context is introductory system dynamics modeling.; The model uses standard stock-and-flow diagram notation.

The deer population remains constant when the inflow (births) equals the outflow (deaths). Given the equations $Births = Deer \cdot Birth\_fraction$ and $Deaths = Deer / Lifespan$, this occurs when $Birth\_fraction = 1 / Lifespan$.

Conditions: The model uses the specific equations $Births = Deer \cdot Birth\_fraction$ and $Deaths = Deer / Lifespan$.; Parameters are constant over the simulation period.

The deer population remains constant when the inflow (births) equals the outflow (deaths). Given the equations $Births = Deer \cdot Birth\_fraction$ and $Deaths = Deer / Lifespan$, this occurs when $Birth\_fraction = 1 / Lifespan$.

Conditions: The model uses the specific equations $Births = Deer \cdot Birth\_fraction$ and $Deaths = Deer / Lifespan$.; Parameters are constant over the simulation period.